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If I understand it correctly a heat pump would have produced the same heat with 1/3 the energy?

Yeah a long way to go but considering we are only really at the beginning of the green energy revolution this is all great news. It affirms that we can do it.

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Can confirm that in my 1920s house, now with heat pump, my energy use is now a fraction of what it used to be, since replacing boiler with heat pump.

Before: Jan 600kWh electricity, 3300kWh gas = 3900kWh

After: Jan 1580 kWh electricity, 20kWh gas (cooking hob)

So in total, 41% of previous amount, and for heating, 30%.

So yes, for crappy uk houses heat pumps are totally fine.

Adding in solar pv, and a time shifting battery, and the bills are maybe £2k per year lower than they would be.

Yes, and a heat pump tends to run at lower output for longer periods of time versus traditional fuel fired boilers so the peak power demand would be even lower still.

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